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MCP specification
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TIMELINE
MCP specification
the whole climb
9 RELEASES · 2024-11-06 → 2026-07-28 · 0 BREAKING
2026
Jul
1
28
2026-07-28
MCP spec: 2026-07-28 revision goes stable
May
1
29
2026-07-28-RC
MCP spec: 2026-07-28 release candidate published
2025
Nov
2
25
2025-11-25
MCP spec: 2025-11-25 revision goes stable
15
2025-11-25-RC
MCP spec: 2025-11-25 release candidate published
Jun
1
18
2025-06-18
MCP specification: 2025-06-18 revision published
Mar
2
26
2025-03-26
MCP specification: 2025-03-26 revision published
26
2024-11-05-final
MCP specification: 2024-11-05 revision finalised
Jan
1
17
2024-11-05
Model Context Protocol: initial 2024-11-05 specification revision
2024
Nov
1
06
2024-10-07
MCP specification 2024-10-07: final update, no described changes